aufs-util: Use cross strip tool

Honor the STRIP variable when passed from environment
Fixes build with musl/raspberrypi

Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>

meta-filesystems/recipes-utils/aufs-util/aufs-util/0001-libau-Define-STRIP-weakly.patch

@@ -0,0 +1,39 @@
+From bb8801fb21ac8d73e3b1a11a8555aaf822182a51 Mon Sep 17 00:00:00 2001
+From: Khem Raj <raj.khem@gmail.com>
+Date: Tue, 5 Sep 2017 10:36:52 -0700
+Subject: [PATCH] libau: Define STRIP weakly
+
+STRIP can be set on environment to use cross version of strip utility
+hardcoding to strip is not working in cross environment
+
+Signed-off-by: Khem Raj <raj.khem@gmail.com>
+---
+Upstream-Status: Submitted
+
+ libau/Makefile | 3 ++-
+ 1 file changed, 2 insertions(+), 1 deletion(-)
+
+diff --git a/libau/Makefile b/libau/Makefile
+index 81520ac..c25eef2 100644
+--- a/libau/Makefile
++++ b/libau/Makefile
+@@ -25,6 +25,7 @@ LibSoHdr = libau.h rdu.h
+ LibSoExport = $(addsuffix .exp, $(basename ${LibSoObj}))
+ LibSoExportErr = $(addsuffix .err, ${LibSoExport})
+ LibSoVerScript = verscript
++STRIP ?= strip
+ 
+ all: ${LibSo}
+ 
+@@ -77,7 +78,7 @@ ${LibSo}.${LibSoMajor}.${LibSoMinor}: ${LibSoObj}
+ 	${CC} --shared -Wl,-soname,${LibSo}.${LibSoMajor} \
+ 		-Wl,--version-script,${LibSoVerScript} \
+ 		${LDFLAGS} -o $@ $^ ${LDLIBS}
+-	strip -R EXP $@
++	${STRIP} -R EXP $@
+ #	readelf --syms --use-dynamic libau.so
+ 
+ install_ulib: File = ${LibSo}.${LibSoMajor}.${LibSoMinor}
+-- 
+2.14.1
+

meta-filesystems/recipes-utils/aufs-util/aufs-util_git.bb

@@ -12,6 +12,7 @@ SRC_URI = "git://git.code.sf.net/p/aufs/aufs-util;protocol=git;branch=aufs4.4 \
            https://raw.githubusercontent.com/sfjro/aufs4-linux/aufs4.4/include/uapi/linux/aufs_type.h;name=aufs_type \
            file://aufs-util-don-t-strip-executables.patch \
            file://aufs-util-add-tool-concept-to-Makefile-for-cross-com.patch \
+           file://0001-libau-Define-STRIP-weakly.patch \
 "
 SRC_URI[aufs_type.md5sum] = "f7b4a255dcb55fe7b0967f5f59b44f19"
 SRC_URI[aufs_type.sha256sum] = "85bc8e4c1a94a7d526c382e4b047b4256cab8c4a65fc0396291707ad9a327a18"
@@ -26,7 +27,6 @@ do_configure_prepend() {
    sed -i -e 's;install_sbin: Tgt = ${DESTDIR}/sbin;install_sbin: Tgt = ${DESTDIR}/${base_sbindir};' \
           -e 's;install_ubin: Tgt = ${DESTDIR}/usr/sbin;install_sbin: Tgt = ${DESTDIR}/${bindir};' \
 	  ${S}/Makefile
-   sed -i -e 's;strip -R;${STRIP} -R;' ${S}/libau/Makefile
 }
 
 do_configure_append () {